Ad networks impact on React sites | The State of Web Vitals 2026

LCP INP CLS

REReact Scoped to 9,570 sites out of 210,902 analyzed (frameworks) Compare with all sites →

At a glance the headline numbers for Ad networks impact

Ad networks ranked by performance impact.

Providers ranked

After min-sites filter

944

Sites in sample

Combined across all items

0.10

Best CLS (p75)

Google AdSense

The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv

The ranking sorted by CLS at p75, fastest first

#	Provider	CLS p75	Passing		Sites
1	Google AdSense	0.10	75.2%		863
2	Google Publisher Tag/GAM	0.16	57.5%		81

The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv

Passing CLS per provider which group passes the CLS most often

ProviderSitesPassing CLSp75

Google AdSense 9% 863 75% 0.10

Taboola 0.1% 5 67% 0.15

Google Publisher Tag/GAM 0.8% 81 57% 0.16

Prebid.js 0.2% 18 50% 0.15

Index Exchange 0.1% 6 50% 0.12

Criteo 0.2% 19 47% 0.15

Amazon Publisher Services 0.1% 5 25% 0.20

Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good CLS (0.1 at p75) · one value per site

The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv

All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75

LCP

INP

CLS

FCP

TTFB

Google AdSense 9%

682.7s

9778ms

750.10

652.2s

451.9s

Google Publisher Tag/GAM 0.8%

782.2s

90143ms

570.16

881.4s

70860ms

Criteo 0.2%

882.2s

100151ms

470.15

881.1s

82737ms

Prebid.js 0.2%

832.2s

92132ms

500.15

921.0s

83570ms

Index Exchange 0.1%

832.2s

100136ms

500.12

100964ms

100390ms

Taboola 0.1%

673.9s

100124ms

670.15

333.2s

672.1s

Amazon Publisher Services 0.1%

1001.4s

10084ms

250.20

100861ms

100373ms

60%95%+ passing Cell: pass rate, small number = p75 · faded rows: under 100 sites

One row per provider, one column per vital - the cell is the share of sites passing, the small number the p75. No toggling needed to see where the category actually differs.

The State of Web Vitals · October 2026 · React sites (9,570) · desktop field datacorewebvitals.io/state-of-cwv

Related signals JS libraries (26) → Email marketing (8) → Font services (4) → CDN (16) → 210,902 crawled sites with Chrome field data, representing millions of real page loads · How we measured

Ad networks impact React sites

At a glance the headline numbers for Ad networks impact

The ranking sorted by CLS at p75, fastest first

Passing CLS per provider which group passes the CLS most often

All five vitals at once the whole category without toggling - cell is the pass rate, small number the p75